Calcium scale builds up around your pool on tile, coping, spill overs, water features & other hard surfaces.
It can be a real pain to remove it. It's an incredibly strong bond. Using a pumice stone requires a lot of effort and can ulitimately scratch tile glaze, remove grout, and even remove painted numbers. And still, there will be some scale left on the surface that isn't obvious but will cause your tiles to have a dull finish.
Likewise, muriatic acid (hydrochlric acid) or other strong acid products CAN DULL your tile's glazing and remove grout over time.
Guardian Pool & Tile Cleaner BREAKS THE BOND between the scale and surface rather than removing it by force with a hard stone.
WHICH MEANS YOU DON'T HAVE TO WEAR OUT YOUR ARM!
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